Elevator mechanism.



No. 732,522. 4 PAT-ENTED JUNE 30, 1903.

A. GOWPERTHWAIT.

ELEVATOR MECHANISM.

APPLIGATION FILED APE.18, 1903'.

N0 MODEL.

UNITED STATES Patented June'SO, i903.

PATENT OFFICE.

ALLAN COWPERTHWAIT, OF NEW YORK, N. Y., ASSIGNOR TO A LON ZO B. SEE AND WALTER L. TYLER, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 732,522, dated June 30, 1903.

Application filed April 18, 1903.

the various landings.

The invention consists of an improvement upon the devices described in the patents of J. S. Muckle, more particularly the patent of Muckle and Teamer, No. 555,825,dated March 3, 1896, whereby said devices become adapted for electrically controlled elevators. The Muckle and Teamer device consists, essentially, of a lock adapted to hold the shaft-door closed. If the car is to stop at a certain landing, the movement'of the car-controller to effect the stop simultaneously throws into operative position a lock-releaser, which as soon as the car reaches the level of the landing, or thereabout, releases the door. On opening the door another latch or look engages with the lock-releaser and prevents the movement of the car-controller to again start the car until the door is closed and locked. These devices are all adapted for mechanically-controlled cars-that is, those in which the motive apparatus is started and stopped by means of a hand wheel or lever in the car which puts tension on one or the other of two ropes or in which a cord passes vertically through the shaft and through the car in order to be pulled in either direction by the operator. 7 My invention consists in combining with the two locking and releasing devices mentioned an electromagnetic device, so'connected with an electric hand-controller in the car and with the electric circuits which operate the car that the same functions are performed.

My invention will be further described in connection with the accompanying drawings,

' in which-- Serial No. 153,192- (No model.)

diagram of the circuits included in my invention.

A isan elevator-car, under the floor of which is fixed a plate a, carrying a slideway a. In

this slideway a bracket-shaped slide 2; is

adapted to move toward and away from the wall of the shaft. The slide is provided with a right-angled flange b on one side and a lug or roller 11 on the other side. Against the wall of the'shaft, immediately. below each landing, is fixed a plate 0, 011 which is arranged an upright bow-shaped elongated spring 0, Whose upper free- .end forms a detent a This spring is adapted to be pressed inward when struck by the roller 11*. On the plate 0 there is also hung a two-armed lever d, one end of which carries a pin cl, adapted to be struck to swing the lever on its center, while the other end is in the form of a detaining-lip adaptedto pass over the flange'b of the slide to prevent the latter from moving. The weight (1 tends to throw the lever into the locking position, as shown. On each of the various doors at the landings'is'fixed a hooke and a releasing-finger c. When the door closes, the hook passes over the detent 0 by which the door is locked in its closed position, and while in this position the releasing-finger e is against the pin d and hold ing lever (1 out of its engaged position with flange b.

The devices so far described are all found substantially in the Muckle and Teamer patent mentioned. I will nowdescribe thede= vices to be combined therewith and constituting my invention.

I support upon the floorof the car in any suitable manner an electromagnet f, having an armature-lever f, carrying a circuit-closing blade f In the path of movement of the blade I arrangeitwo stationary contactclips 9 and g, supporting them upon an arm g or in any other suitable. manner, and I provide a spring h, arranged to force the armature-lever away from the pole ofthe mag- -:.=net when the latter is deenergized. inature-leverf" connects by means of a rod 1,

The arwith the slide b, the point of attachment to the slide being either the stud upon which roller 6 turns or an entirely separate connection. 'Thefunction o the magnet is to pull the slide away from the wall of the shaft and at the same time bridge the contacts 9 and 5 while the function of the spring 7b is to move the slide in the opposite direction and open the circuit across 9 and g.

In the elevator-car an electric hand-switch of any of the usual forms for controlling the movements of the car is provided. As shown, this switch consists of a hand-lever p, carrying two metallic insulated plates 1) and 19 The lever is adapted to be thrown to one side or the other, depending upon the direction the car is to be moved. lVhen the car is moving in either direction, the circuit is complete through the magnet f and across the contacts 9 and g. For instance, if we assume the car to be moving upward the lever will be in the position of the dotted line (1 to the right and the circuits will be as follows: from wire 1 to contact 9, plate 27 contact 3, wire =l, wire 5, contact g, bladef contact 9, wires 6 and 7, magnet f, wire 8, contact 9, plate p, contact 1.0, and wire 11. A similar circuit can be traced when the switch-arm is in a corresponding position to the left by beginning with wire 12 instead of wire 1. The two wires 1 and 12 connect with the controlling apparatus in the cellar or other location near the motor to determine the direction of movement of the car. The contacts 9 and 10 on each side of the switch are longer than the contacts 2 and :3, so that the plate 1) will engage with f) and 10 before plate 21 engages with contacts 2 and 3. The object of this is to close the circuit through magnet f first, and if the conditions are such that the armature-lever f can respond to the pull of the magnet the main circuit will thereafter be closed by the joint operation of blade and plate 1) but in case armature-lever f does not respond the closure of contacts 2 and 3 by plate 12 will not suflice to start the car, since the main circuit will still be open across contacts 9 and g.

The operation, therefore, is as follows: Vhen the doors at the landings are closed, the hook e engages with the detent c and finger c is holding lever (Z in an upright position. at which a stop is to be made, the operator throws lever 1) to the central position at the proper time to bring the car to an accurate stop. In doing so he opens the circuit of magnet f, (heretofore traced.) This permits spring h to throw armature-lever f and the rod i forward, thus forcing the slide outward and causing the roller b carried by it to engage spring 0 and push the detent c out of engagement with h 00k 6 just as the car comes to a stop at the landing. The main circuit is now open at the contacts g and g. The door is then opened to let off or admit passengers. The movement of the door releases pin cl and allows the weight (Z to swing lever (l into the position shown in Fig. 1, where :it engages with flange Z) of the slide. it will now be seen that if the operator attempts to start the car Vhen the car approaches a landing before fully closing the door he can, as usual, throw the hand-lever 1) either to the right or left, and in either case the first portion of the movement will close the circuit of the magnet, as follows: Assuming the car to be going down and the lever to be in the position of dotted line 0-, from wire 1.1 to contact 10, wire 13 to the other contact 10, plate 2, wire 14, wire 8, magnet f, wire 7, and wire 15. Wires 11 and 15 being connected with the positive and negative main wires, magnet f is energized, but armature-leverf" cannot respond because the slide is locked by lever (1. Hence when the operator completes the movement of the switch-lever to the left and closes contacts 2 and the car will not start because the main circuit is still open at g and g. The operator is therefore compelled to close the door. \Vhen this is done, finger e swings lover (I and releases the slide and hook e engages detent 0 locking the door in its closed position. \Vhen the hand-lever is again thrown to the left and reaches the position r, magnet f, being energized as before, pulls the slide and closes the main circuit at g and g, so that when plate 19 bridges the contacts 2 the main circuit will be closed and the car will move in the downward direction, the circuit being as follows: from wire 12, contact 2, plate 13 contact 3, wires 4 and 5, contact g, blade f contact g, and wires 6 and 15.

It will thus be seen that for an electricallycontrolled elevator I have provided an arrangement whereby the stopping of a car at a landing releases the door, and after the same is opened the car is prevented from moving until the door is again closed.

Having described my invention, I claim-- 1. The combination of an elevator-carpinvided with electrical controlling mechanism, a movable door at a landing, a latch adapted to lock the door in the closed position, electromagnetic devices on the car adapted to release the door from the latch when themechanism is operated to stop the car and connections on the car between said electromagnetic mechanism and said electric controlling mechanism, substantially as described.

2. The combination of an elevator-ear provided with electrical controlling mechanism, a movable door at a landing, a lock for the door in its closed position and electromagnetic devices cooperating with said electrical controlling devices on the car to release said lock when the controller is moved to stop the car.

3. The combination of an elevator-car, a movable door at a landing, a 10Gk f01' said door in its closed position, a lock-releasing device carried by the car, a detent for said lock-releasing device, means carried by the door for removingsaid detent, an electromagnet adapted to move said lock releasing means, a main circuit controlling the elevatormotor, a cut-out in said circuit controlled by said magnet, and a switch in the car controlling the circuit of said magnet and also operating a second cut-out in said main circuit.

I ders the electrical controller inoperative until 10 the door is again'closed.

In witness whereof I subscribe my signature in presence of two witnesses.

ALLAN COWPERTHWAIT.

Witnesses:

FRANK S. OBER, WM. A. ROSENBAUM. 

